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Co-ground mineral/microfibrillated cellulose composite materials: Recycled fibers, engineered minerals, and new product forms, TAPPI Journal January 2021
ABSTRACT: When pulp and minerals are co-processed in suspension, the mineral acts as a grinding aid, allowing costeffective production of mineral/microfibrillated cellulose (MFC) composite materials. This processing uses robust milling equipment and is practiced at industrial scale. The resulting products can be used in many applications, including as wet- and dry-strength aids in paper and board production.Previously, we have reported that use of these MFC composite materials in fiber-based applications allow generally improved wet and dry mechanical properties with concomitant opportunities for cost savings, property improvements, or grade developments. Mineral/MFC composites made with recycled pulp feedstocks were shown to offer at least equivalent strength aid performance to composites made using virgin fibers. Selection of mineral and fiber allows preparation of mineral/MFC composites with a range of properties. For example, the viscosity of such formulations was shown to be controlled by the shape factor of the mineral chosen, effective barrier formulations were prepared, and mineral/MFC composites with graphite as the mineral were prepared.High-solids mineral/MFC composites were prepared at 75% total solids (37% fibril solids). When resuspended and used for papermaking, these high-solids products gave equivalent performance to never-dried controls.
Journal articles
Magazine articles
Three-dimensional visualization and characterization of paper machine felts and their relationship to their properties and dewatering performance, TAPPI Journal July 2021
ABSTRACT: Polymeric felts are commonly used in the papermaking process on the paper machine wet end, in the press section, and in the dryer section. They provide an important function during paper manufacturing, including as a carrier or support; as a filter media assisting with water removal on the paper machine; in retention of fibers, fines, and fillers; and in some applications, such as tissue and towel, to impart key structural features to the web. These felts can have highly interwoven complex internal structures comprised of machine direction and cross-machine direction yarns of varying sizes and chemical compositions. Here, we present a non-intrusive three-dimensional (3D) image visualization method using advanced X-ray computed tomography (XRCT). This method was used to characterize the complex 3D felt structure and determine the water removal characteristics of some commonly used paper machine felts. The structural features analyzed include porosity; specific pore-yarn interfacial surface area; 3D pore size distribution; 3D fiber or yarn-size distribution; and their variations through the thickness direction. The top, middle, and bottom layers of the felt have very different structures to assist with water removal and impart paper properties. The size distribution of the yarns, as well as the pores in the different layers of the felt, are also inherently different. These structural features were non-intrusively quantified. In addition, variation in the structural characteristics through the thickness of the felts and its potential role in papermaking is explored. In addition to the 3D structural characteristics, permeability characteristics and water removal characteristics, including rewetting of select felt samples, have also been experimentally determined. It is interesting to observe the relationship between key structural features and permeability and water removal characteristics. These relationships can provide additional insights into press felt design, as well as ways to improve product properties and the dewatering efficiency and productivity of the paper machine.
Journal articles
Allocation of carbon dioxide emissions from key production steps in high-grade paper mills, TAPPI JOURNAL August 2013
Allocation of carbon dioxide emissions from key production steps in high-grade paper mills, TAPPI JOURNAL August 2013
Journal articles
Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery, TAPPI JOURNAl, July 2008
Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery, TAPPI JOURNAl, July 2008
Journal articles
Application of sericite to LWC coatings, TAPPI JOURNAL June 2008
Application of sericite to LWC coatings, TAPPI JOURNAL June 2008
Journal articles
Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010
Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010
Journal articles
CFD-Based Modeling of Kraft Char Beds â?¢ Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010
CFD-Based Modeling of Kraft Char Beds • Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010
Magazine articles
Editor's Note: Bright future for coating at ACFS, TAPPI JOUR
Editor's Note: Bright future for coating at ACFS, TAPPI JOURNAL November 2010
Journal articles
A novel approach to quantify spatial coating-layer formation, TAPPI JOURNAL November 2010
A novel approach to quantify spatial coating-layer formation, TAPPI JOURNAL November 2010
Journal articles
Experimental and theoretical study of the manifold flow in a curtain coater, TAPPI JOURNAL November 2010
Experimental and theoretical study of the manifold flow in a curtain coater, TAPPI JOURNAL November 2010